[plt-scheme] Another MysterX patch: GetActiveObject functionality

Hi all,

I've made a small MysterX patch to add GetActiveObject functionality. 
With this patch, if you want to get hold of an Excel.Application object 
(for example), you don't have to go to the trouble to create one of 
those objects if Excel is running (and it will take a small fraction of 
the time).

I'm using MysterX to automate AutoCAD through MzScheme and AutoCAD takes 
around 1 minute (or more) to start using cci/coclass. For what I'm 
doing, I can just take the running AutoCAD application, and that (with 
GetActiveObject) will take only 0.5 seconds ;-)

This patch adds two functions:
com-get-active-object-from-coclass
and its short name: cgao/coclass
I can live without the short name, I just thought about abbreviating it 
like cci/coclass.

Regards,

   F
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